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Ponceau 4R

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Identification
Molecular formula
C20H11N2Na2O7S2
CAS number
2611-82-7
IUPAC name
disodium;6-hydroxy-5-[(4-sulfonato-1-naphthyl)azo]naphthalene-2-sulfonate
State
State

Ponceau 4R is typically available as a solid powder at room temperature. It is soluble in water, forming a red solution.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.15
Boiling point (Celsius)
223.00
Boiling point (Kelvin)
496.15
General information
Molecular weight
604.47g/mol
Molar mass
604.4700g/mol
Density
1.2600g/cm3
Appearence

Ponceau 4R appears as a red to reddish-brown powder or granules. It's commonly used as a synthetic colorant in food and displays a distinct vibrant red hue when dissolved in water.

Comment on solubility

Solubility of Disodium 6-Hydroxy-5-[(4-sulfonato-1-naphthyl)azo]naphthalene-2-sulfonate

Disodium 6-hydroxy-5-[(4-sulfonato-1-naphthyl)azo]naphthalene-2-sulfonate, often referred to as a dye compound, exhibits interesting solubility properties:

  • Highly Water Soluble: This compound is known for its high solubility in water, making it an ideal choice for various applications in aqueous environments.
  • Ionization: The presence of sulfonate groups greatly enhances its solubility due to ionization. In solution, these sulfonate groups dissociate, leading to increased interaction with water molecules.
  • pH Sensitivity: The solubility can be influenced by the pH of the solution. At different pH levels, the ionization state of the sulfonate may change, potentially altering the solubility.
  • Organic Solvents: This compound tends to have limited solubility in non-polar organic solvents, which further emphasizes its preference for aqueous systems.
  • Applications: Its solubility characteristics make it widely utilized in biological and chemical analyses, where consistent mixing and dispersal in water are crucial.

Overall, the solubility profile of this compound underscores its potential as a versatile agent in various chemical and biological scenarios, particularly in water-based systems. As such, understanding its solubility is key for optimizing its use in practical applications.

Interesting facts

Interesting Facts about Disodium 6-Hydroxy-5-[(4-sulfonato-1-naphthyl)azo]naphthalene-2-sulfonate

Disodium 6-Hydroxy-5-[(4-sulfonato-1-naphthyl)azo]naphthalene-2-sulfonate, commonly known as an azo dye, is a fascinating compound with a variety of uses and interesting properties. Here are some notable facts about this compound:

  • Azo Colorants: This compound belongs to the class of azo dyes, which are characterized by their vibrant colors and wide-ranging applications in textiles, food, and cosmetics. Azo dyes are particularly valued for their ability to produce bright hues across the color spectrum.
  • Environmental Concerns: Although azo dyes are popular in various industries, they raise environmental concerns due to their potential to degrade into toxic compounds. This has led to increased scrutiny and regulatory measures to ensure safe usage.
  • Reactivity: The presence of sulfur and hydroxyl functional groups in its structure contributes to the compound's reactivity, making it useful for specific chemical reactions and modifications in synthetic chemistry.
  • Analytical Applications: This compound can be used as a dye in analytical chemistry, particularly in spectroscopic techniques, where it helps in quantifying and visualizing certain analytes due to its intense color.

Azo dyes, including disodium 6-hydroxy-5-[(4-sulfonato-1-naphthyl)azo]naphthalene-2-sulfonate, are remarkable due to their versatility, but they should be handled with caution due to their potential environmental impact. As chemistry students and scientists continue to explore safer and more sustainable alternatives, understanding azo compounds remains key in various research fields.

In the words of a prominent chemist, "The challenge is not to eliminate azo dyes, but to make their use safer and more sustainable for future generations."

Synonyms
Acid Red 13
C.I. Acid Red 13
5926AP228X
CI 16045
1-Naphthalenesulfonic acid, 4-(2-(2-hydroxy-6-sulfo-1-naphthalenyl)diazenyl)-, sodium salt (1:2)
1-Naphthalenesulfonic acid, 4-[2-(2-hydroxy-6-sulfo-1-naphthalenyl)diazenyl]-, sodium salt (1:2)
C.I. Acid Red 13 (7CI)
2302-96-7
Fast Red E
Food Red 4
C.I. Food Red 4
C.I. 16045
Tertracid Red E
Sodium 4-((2-hydroxy-6-sulfonatonaphthalen-1-yl)diazenyl)naphthalene-1-sulfonate
85283-71-2
HD Fast Red E
Neklacid Red E
Dalf Fast Red
Acidal Red E
Acidol Red E
Acilan Red E
Cilefa Red E
Red E for food
1-Naphthalenesulfonic acid, 4-((2-hydroxy-6-sulfo-1-naphthalenyl)azo)-, disodium salt
1-Naphthalenesulfonic acid, 4-[(2-hydroxy-6-sulfo-1-naphthalenyl)azo]-, disodium salt
disodium;6-hydroxy-5-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2-sulfonate
Naphthionic Red A
Naphthalene Red EA
Cherry Red A Geigy
Crispin Fast Red E
Hexacol Fast Red E
Hexalan Fast Red E
Certicol Fast Red E
Hispacid Fast Red E
Neklacid Fast Red E
Acid Leather Red IBW
HD Fast Red E Supra
Fast Red Specially Pure
Brilliant Ponceau 3RF Extra
1869 Red
C.I. Acid Red 13, disodium salt
EINECS 218-958-5
EINECS 286-600-5
DTXSID3062314
UNII-5926AP228X
CHEBI:180880
XYTVLRKJXNXOOI-CAPIVQQTSA-L
CAA30296
Disodium 4-((2-hydroxy-6-sulphonatonaphthyl)azo)naphthalenesulphonate
MFCD00191366
AKOS015903546
AKOS025310825
4-((2-Hydroxy-6-sulpho-1-naphthyl)azo)naphthalene-1-sulphonic acid, sodium salt
A1243
NS00048636
D88402
Q27896497
1-Naphthalenesulfonicacid,4-[2-(2-hydroxy-6-sulfo-1-naphthalenyl)diazenyl],sodium salt
disodium 6-hydroxy-5-[(4-sulfonato-1-naphthyl)diazenyl]-2-naphthalene sulfonate
disodium 6-hydroxy-5-[2-(4-sulfonatonaphthalen-1-yl)diazen-1-yl]naphthalene-2-sulfonate
disodium;6-hydroxy-5-[(4-sulonatonaphthalen-1-yl)diazenyl]naphthalene-2-sulonate